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Mine is a 20in from woa. If their barrels are the same contour as the ones on their 6x45 I would go to a 22 or 24in barrel and it would give you more speed. But I would not change anything with my upper. It is a tack driver. Have not ran it over a crono yet. Not really interested in speed. More of a need for tight groups. And it is a tack driver. Fun round to shoot. Squeeze trigger and watch the hole appear in the target.